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Django's standard crypto functions and utilities.
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Returns the HMAC-SHA1 of 'value', using a key generated from key_salt and a
secret (which defaults to settings.SECRET_KEY).
A different key_salt should be passed in for every application of HMAC.
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Returns a securely generated random string.
The default length of 12 with the a-z, A-Z, 0-9 character set returns
a 71-bit value. log_2((26+26+10)^12) =~ 71 bits
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Returns True if the two strings are equal, False otherwise.
The time taken is independent of the number of characters that match.
For the sake of simplicity, this function executes in constant time only
when the two strings have the same length. It short-circuits when they
have different lengths. Since Django only uses it to compare hashes of
known expected length, this is acceptable.
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Convert a binary string into a long integer
This is a clever optimization for fast xor vector math
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Convert a long integer into a binary string.
hex_format_string is like "%020x" for padding 10 characters.
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Implements PBKDF2 as defined in RFC 2898, section 5.2
HMAC+SHA256 is used as the default pseudo random function.
As of 2011, 10,000 iterations was the recommended default which
took 100ms on a 2.2Ghz Core 2 Duo. This is probably the bare
minimum for security given 1000 iterations was recommended in
2001. This code is very well optimized for CPython and is only
four times slower than openssl's implementation. Look in
django.contrib.auth.hashers for the present default.
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